Machine for drawing metal bars



(No: Model.)

.L. BRIGHTMAN. MACHINE FOR DRAWING METAL BARS Patented Dec. 5,1882.

2 v IN'VENTOR I U ATTORNEYS UNITED STATES- LATHAM BRIGHTMAN, OF CLEVELAND, OHIO.

MACHINE FOR DRAWING METAL. BARS.

SPECIFICATION forming part of Letters Patent No. 268,456, dated December 5, 1882,

Application filed March 17, 1882. (No model.)

To all whom it may concern Be it known that I, LATHAM BRIGHTMAN, of Cleveland, in the county of Ouyahoga and State'of Ohio, have invented certain new and useful Improvements in Machines for Drawing Metal Bars; and I do hereby declare the following to be a. full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to machines for drawing metal bars; and it consists inthe peculiar construction of the same, as will be hereinafter fully set forth and claimed.

In the drawings, Figure l is a side elevation of a machine embodying my invention. Fig. 2 is a plan view of my improved drawing-die; and Fig. 3 is a vertical section taken through the same.

A is the frame of my machine, in which are journaled the chain-wheels B B, which engage with and operate to drive the chain (J.

D is my clamping device, which is mounted on wheels D, and is shown mostly in dotted ]ines,.Fig. 1. This clamping device is composed of an upper and lower jaw, a and b, the upper jaw, a, being pivoted to the lower jaw,

.11, near its forward end, and provided at its rear end with 'a set-screw, c, the lower end of said set-screw c resting on a seat, (I, formed on the lower jaw, b, and the thread of said setscrew (not shown) engaging with a female screw-thread in the upper jaw, a. Thus when the set-screw c is turned in one direction it acts to close the jaws a and b, and when turned in the opposite direction it acts to open the jaws for the purpose of clamping or releasing the bar.

To allow the clamping device to more securely hold the end of the bar to bedrawn, I first reduce the diameter of the-end of the bar so as to allow of itspassing through the die far enough to be grasped, and then again reduce the bar a short distance fromthe end, formiu g a shoulder, e, and head f. The grasping end of the clamping device D is made so as to conform to the shape of this end, and by engaging with it to hold it. tightly, and thus prevent it from slipping out of said clamping device D.

My preferred manner of shaping the end of the bar is shown in Fig. 3 of the drawings.

- E is a hook, which is pivotally attached to the rear end of the clamping device, and is adapted to engage with the links of the chain means of the set-screw c.

l O. This hook E is operated by means of a bell-crank lever, F, and weighted lever Gr, as will be hereinafter set forth.

H is the die-holder of my machine.

I is my drawing-die, which is preferably made of cast metal, (iron or steel,) and provided, as is usual, with a tapering hole, I.

Surrounding my die I is a band of wroughttnetal, J, which is preferably shrunk on the same. This band J acts to strengthen the said die I, and prevent it from breaking apart by the force of the metal as it (the metal) is being drawn through the said die.

The operation of my device is as follows: Power is applied to the wheels B and B in such a manner as to cause them to move the chain O'in the direction of the arrow, Fig. l, the hook E being held out of contact with the said chain 0 by means of the weighted leverGr, which is secured tothe bell-crank lever F. The bar after being reduced, as hereinbet'ore described, is passed through the die I, which is secured in the die-holder H. Thejaws of the clamping device 1) are then caused to grasp the prepared end of the bar, being operated by The hook E is now caused to engage with the chain, (by hooking into one of the links,) which pulls the clamping device D in the direction of the arrow, which in turn acts to pull the bar through the die I, and thereby reduce it. When the end of the bar has been reached and passed through the die, the strain being removed from the hook E, the weighted lever G act's'to disen-' gage it from the chain 0, and the clamping device stops and the bar may be removed.

, What I claim isr 1. In a machine for drawing metal bars, the

combination, with a clamping device, of a hook -for engaging with the chain, and a weighted lever attached to said hook for automatically disengaging the hook from the chain when the strain is removed, substantially as and for the purpose shown and described.

2. The combination, with the chain, the carriage D, and hook E, of the clamping-jaws a b, set-screws c, and weighted lever, substantially as set forth.

In testimony whereof I have signed myname to this specification in the presence of two subscribing witnesses.

L-ATHAM BRIGHTMAN.

Witnesses:

W. ENGEL, M. D. Lneenrr. 

